• Support PF! Buy your school textbooks, materials and every day products Here!

Yo-yo's, Moment of Inertia, and Rotational Potential Energy

  • Thread starter conrthomas
  • Start date
  • #1
See the attached PDF document, all information is given and the help I need is on number 2-5, which is all one problem. I do already know that you have to do 2, then 5, then 3, then 4. Between 30 of my friends and I, we cannot get it.

Thanks in advance.
 

Attachments

Answers and Replies

  • #2
ok lets start with the second question
you must understand the body is doing both translational motion.
the axis here is the line along which it is rotating. it is passing through three cylinders
for a cylinder MI =(mr^2)/2
you need to calculate for each cylinder and then add these
 
  • #3
for third and fourth questions:
when you have found the MI then:
draw the fbd....
there are two forces on the object- weight and tension here tension in unknown
you know one thing - since there is no slipping the point of object in contact with rope will have zero acceleration.
from this much information you can find tension and acceleration
 
  • #4
you can easily solve the fifth question once you have solved the third and fourth
 
  • #5
the order was not correct
you cannot do 5 without knowing acceleration
 

Related Threads for: Yo-yo's, Moment of Inertia, and Rotational Potential Energy

  • Last Post
Replies
14
Views
14K
Replies
1
Views
3K
  • Last Post
Replies
10
Views
6K
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
13
Views
6K
Replies
6
Views
9K
Replies
3
Views
4K
Replies
2
Views
4K
Top